Oil-well swab



vOct; so; 1923. 1,472,487

' E. MURRAYl OIL WELL SWAB Filed 'June` 27 1922 I Patented ct. 3Q, 1923.

. 7 wat? r EDGART. MURRAY, erronr WORTH., TEXAS..

oiL-wnrm swan,

Application filed .Tune 27,

To all whom 15 may concern v v Be it known that l, EDGAR T. MURRAY, a

citizen of the United States, residing at Fort l/Vorth, in the county of Tarrant and State of Texas, have invented new and useful Improvements in Oil-Well Swabs, of which the' following is a specification.

This. invention relates to oil well swabs,

such as are used for drawing water and l0 other foreign substances from an oil or gas well for a cleansing'action, in order to restore or renew the flow of oil or gas.

@ne obj ect of the invention is to provide a construction which allows fluid and fine solid substances to vpass into and upward through the swab, while excluding obstructing substances, thus preventing choking of the swab, an objection to swabs of the type in common use.

Another object of the invention is to providerrnovel andV improved means for aording relief, when the pressure in the vwell above the swab causes thepaclring to unduly expand and bind, inhibiting its extraction or upward movement, whereby the eX- cess pressure above may be removed, allowing the swab to be easily'raised or extracted and preventing breaking of theparts .which might otherwise occur.

A still further object of the invention is to provide a swab which is simple, reliable and inexpensive in construction, and generally more efficient than the swabs in common use.

The invention consists of thev features of construction, combination and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying drawing, in which z 4.0 Figure l is a verticall longitudinal section through a well swab embodying my invention, showing the parts in normal position,

Figure 2 is a similar view illustrating the opening of the valve for a relief action,

n Figure 3 is a detail view of the valve seat,

and l Figure t is a detail view taken on line 4 4 of Figure l. Y

Referring now more particularly to the drawing, 5 represents the head or body portion proper Vof the swab, the upper end of which is reduced and eXteriorly threaded as at 6 for application to the well rod or other apparatus, and the internal bore 7 opening i922. serial no. 571,135,

inwardly from the lower end of'the'head n threadedly receives the upper end ofV a mandrel or tube indicated at 8. The. tube or mandrel 8 supportsftheanges 9 and swab rubberfmembers 10, a nut 11 near the lower end of the tube holding these members properly in place.

rihe internal borey 7 has communicating therewith the inner ends of divergentV openings 12, l and from thesaid internal-bore. A. valve seat indicated at 13 is disposed within the bore 7, and a ball or other suitable form'of valve 14 rests upon this seat. c This seat is in the form of a tubular vmember as shown particularly in Figure 3, the said member hav-` ing an annularn flange 15 thereon, intermediate its ends, adaptedto rest upon the upper Y extremity of themandrel 8. By constructing the seat in this manner it is apparent that'the same is readily reversible.` .The ball 14 is of such size as, to snugly engage the uppermostseat and to tightly close the sameunder normal conditions.

through which fluid may pass to f.

Disposed within the mandrel 8 near the 'i This deviceconsists of a length ofspring' metal bentnpon itself to provide oppositely arranged curved arms'18, and

the ycentral l portion of this member is secured tofthe lower eXtremity'of the valvestem as sho-wn. The ends of this Vspring member are provided with longitudinally disposed slots'i'ndicated at 19, through which the valve stem" 17 passes The ends'of the member 18 are disposed in super-posed relation as shown, and the slots 19 therein are of sufficient length to permit of a variation of movement in the said arms.

The lower end of mandrel 8 is provided with laterally disposed openings as lshown at 20, through which gas or liquid may pass. ln operation, the tool is assembled in the manner VShown in the drawing, and adjustment of the rubber devices is madein the Usual mannerto adapt the swab to the particular casing. The swab is lowered into the casing andthe laterally Ydisposed arms 18 of the vvalve actuating device engage with mit the ball 14 to seat.

the sides of the casing and offer some slight resistance to the downward passage of the swab. This resistance, while not suflicient to retard the movement of the swab itself, causes sufficient 'binding action to move the valve stem 17 upwardly untilithe upper eX-.

Itis apparent from the foregoing that I haveprovided improvements in de Aces of this character which will at once overcome (the disadvantages heretofore encountered with devices usedin similar capacities, and one wherein the several parts are so constructed and arranged that danger of derangement of the several parts is reduced to a minimum.

While the above is a description of the invention in vits preferred form, it will be understood that Avarious changes in the minor details'of'construction and arrangement of-parts ymay be resorted to if desired, without departing frointhe spirit ofthe invention as defined by the claims.

Having thus fully described my invention, I claim: v

r-l. rIn 1a device of the class described, a body, a hollow mandrel depending from said body, the said body having a bore in communioationfwith said mandrel and laterally disposed openings establishing communication between the lbore and the exterior of the body, a yvalve in said bore, and means carriedfby the ,body whereby the said valve will beunseated whenthe body'is moved in one direction. I

2. kIn `a .device of the class described, a body having a borein its lower end, a valve in said bore, a mandrel carried by said body, a rod disposed within said mandrel and adapted to unseat said valve, and spring arms carried by said rod and extending outwardly therefrom.

3. ina devre of the class described, a body having a bore in its lowerk end, a mandrei engaged in said bore, a valve seat above said mandrel, a stem slidable in said mandrel and projecting below the lower end thereof, friction arms carried by the lower end of said rod, and the upper' end of said rod adapted to engage and open said valve when said body is moved in one direction.

l. In a device of the class described, a body having a bore in the lower end thereof, the said body having lateral openings eX- tending therethrough and communicating with said bore, a valve in said bore below said openings, a mandrel carried by said body and depending therefrom, a rod slidable longitudinally within said mandrel and projecting beyond the lower end thereof, and vfriction arms carried by said rod and projecting laterally therefrom.

5. In a device'of the class described, a body having a bore in the lower end thereof, the said body having laterally disposed openings extending ltherethrough and communicating with said bore, a mandrel en-V gaged in the lower end of said bore, a valve seat resting` upon said mandrel, ball rest ing upon said seat, a rod slidable within said mandrel and longitudinally thereof, the lower end of said rod projecting below the lower end of said mandrel, and spring arms carried by the lower end of said rod and projecting laterally therefrom.

6. In a device of the class described, a body havinga valveI therein, a rod slidably carried by. said body and adapted when' moved. in one direction to open said valve, a spring member secured intermediate .its ends to the lower end of said rod and having its ends'bent inwardly and lying in su perposed position adjacent said rod, and` the said superposed ends having elongated openings therein through which said rod passes. v

In testimony whereof I aiiiXfmy signature. Y

,EDGAR T. MURRAY. 

